object Test extends Application {
  def testSeq(name: String, expected: Seq[Char], got: Seq[Char]) {
    if (expected.toList == got.toList)
      println(name + " ok")
    else
      println(name + " failed: " + expected + " differs from " + got)
  }

  testSeq("'a' to 'c'", List('a', 'b', 'c'), 'a' to 'c')
  testSeq("'a' until 'c'", List('a', 'b'), 'a' until 'c')

  testSeq("'a' to 'b'", List('a', 'b'), 'a' to 'b')
  testSeq("'a' until 'b'", List('a'), 'a' until 'b')

  testSeq("'a' to 'a'", List('a'), 'a' to 'a')
  testSeq("'a' until 'a'", List(), 'a' until 'a')

  testSeq("'b' to 'a'", List(), 'b' to 'a')
  testSeq("'b' until 'a'", List(), 'b' until 'a')

  testSeq("'c' to 'a'", List(), 'c' to 'a')
  testSeq("'c' until 'a'", List(), 'c' until 'a')
}

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